JAVA CONCEPTS

Important Java Mcq 1

A java exception is an instance of

a. RuntimeException

b. Exception

c. Error

d. Throwable

e. NumberFormatException

Answer:

d. Throwable

Explanation:

Every exception is represented by an instance of the class Throwable. To understand it better please go over exception handling as a concept.

Which of the following declaration does not compile?

a. double num1, int num2 =0; b. double num1, int num2 =0; c. int num1, num2 = 0; d. int num1 = 0, num2 =

Which of the following is an implicit object?

a. Vector b. ln c. Response d. Request Answer: d. Request Explanation: The JSP request is an implicit object of type HttpServletRequest. It can be used

In Java all output uses the ______ data type.

a. int b. scan c. String d. double e. char Answer: c. String Explanation: In Java, String is the data type for all outputs.

Which interface should be implemented for sorting on the basis of many criteria?

a) Comparator b) Comparable c) Serializable d) None of the above Answer: a) Comparator